软件设计-理论课08.ppt

1、软件体系结构，软件体系结构，课程内容，2，软件体系结构样式(2)，软件体系结构样式，概述，虚拟机到解释程序样式虚拟机(Virtual machitecture Styles虚拟机，5，问题，您认为JAVA最有吸引力的特征是什么？built-in networking、good performance、dynamic binding、security、automatic memory management、several dangerous feesimport Java . io . io exception；public class pipe private piped reader _；p

2、rivate piped writer _；public pipe()throws io exception writer _=new piped writer()；reader _=new piped reader()；/let this piped writer to be connected to the piped reader writer _。connect(reader _)；管道，47，/writes char to the piped output stream public void write(intc)throows io exception writer _。写入(c

3、)；/reads the next character of data from this piped stream public intread()throws io exception return reader _。read()；public void close writer()throowio exception writer _。flush()；Writer_。close()；public void close reader()throws io exception reader _。close()；过滤器、Abstract Class Filter、48、过滤器、49、publi

4、c Abstract Class Filter implements runnable protected pipe input _；protected Pipe output _；private boolean is _ started _=false；Public filter (pipe input，pipe output)input _=input；Output _=outputPublic void start() if(！is _ started _)is _ started _=true；Thread Thread=new Thread(this)；thread . start(

5、)；public void stop()is _ started _=false；滤镜、50、public void run()transform()；/* * this method transforms the data from the input pipe and writes the * transformed data into output pipe。*/abstract protected void transform()；过滤器，concrete class，51，kwic，52，in=new file input stream(file)；Pipe in _ cs=new

6、Pipe()；/create three objects of pipe pipe cs _ al=new pipe()；/and one object of type pipe al _ ou=new pipe()；/file inputstream input=new input(in，in _ cs)；circular shifter=new circular shifter(in _ cs，cs _ al)；alphabetizer alpha=new alphabetizer(cs _ al，al _ ou)；Output Output=new Output(al _ ou)；/ou

7、tput to screen input . start()；shifter . start()；阿尔法。start()；output . start()；解决方案1:管道和过滤器，优点：进程流高度直观支持过滤器易于修改的功能相互隔离新功能添加缺点：不支持交互系统例如：如果手动删除行，则空间复杂性高每个过滤器都必须将所有数据复制到输出，53，与其他方案比较：调用子程序，54，private ArrayList kwicListPublic kwic(字符串文件名)kwi clist=new ArrayList()；k wiclist=read(filename)；shift()；/kwicLi

8、st sort()操作；/kwicList display()操作；/kwicList操作.解决方案2:面向对象的样式，55，解决方案2:面向对象的样式，采用OO的想法，对数据和数据进行的读写操作封装在object中，主程序调用这些object以形成控制过程。数据不再由组件直接共享，封装在对象内的每个对象都提供了一个接口，其他对象可以通过该接口调用对封装在该对象内的数据的操作(类图：主控制程序、输入对象、输出对象、排序对象、循环移动对象、行数据存储对象、解决方案2:面向对象的样式、line storage obbleAlphabetizer object负责对循环移位后获取的数据进行排序。58

9、，解决方案2:面向对象的样式，Output object在对输出进行排序后控制数据主控制对象(控制从其他对象调用方法的顺序，59，控制主控制程序，输入对象，输出对象，排序对象，Output object)解决方案2:面向对象的样式；解决方案2:面向对象的样式；构建主对象KWIC 5个对象实例line storage lines=new line storage()；Input Input=new Input()；circular shifter=new circular shifter()；alphabetizer alphabetizer=new alphabetizer()；Output Output=new Output()；然后，它调用这五个对象实例的部分方法input.parse(file，lines)。shifter . setup(lines)